The invention relates to a method of purifying a crystalline silicon substrate and to a process for producing a photovoltaic cell. A cavity is etched at a selected side of the semiconductor substrate, and the selected side is then fusion bonded to another substrate, such as a carrier substrate. The digital television bit-stream comprises video, audio, and data information, as well as tables that describe the content of the bit-stream. The adjustable configurations of the mounting apparatus can be used to fold the mount into a compact position. The entire area of each opening is filled with a solder ball for mounting a substrate, and the recess of each external connection region is filled with the solder ball, thereby connecting each solder ball to the intermediate layer. Again, the on-screen display generator produces an on-screen display including multiple cells according to the new picture control settings, with the end user selecting one of the cells providing a preferred picture quality.